Roller.



J. S. JOHNSTON.

ROLLER.

APPLICATION FILED MAR.20. I914.

lgrwfififim Patented Dec. 12, 1916.

WETNESSES INVENTOR ZZW /EXMQ JAMES s; uollA/m/v /u/ '%fl% ATTORNEY I20 acte'r, whereby to lessen the wear occasioned threaded to the interior of the recess 27 and JAMES S. JOHNSTON, F UTICA, NEW YORK.

ROLLER.

1,203,563. Specification of Letters Patent Patentedjwec. 12, 12M. Application filed March 20, 1914. Serial No. 826,096.

To all whom it mag concern: upon the threaded parts 18 of the sleeves 10. Be it known that ll, JAMES S. JOHNSTON, a Theplaten 14 18 made of a composition comcitizen of the United States, residing. at pr sing rubber and fabric or of any other Utica, in the coun y of Oneida and-State of Suitable material that has the de s1rable re- 6O 5 New York, have inve ted c rtai w nd siliency. The sleeves 6 form a1rt1ght o1nts useful Improvements in Rollers, of which the Wlth the Shaft by means of the packfollowing is a specification, reference being lng washers disposed in the annular rehad therein t the a o a yin d wi g, cesses formed by thesnoulders 7 of the shaft y invention relates to a roller, and I -1 and the ad3acent walls 8 of the 1o declare the followin to be a full, clear, con- Sleeves cise and exact description thereof, sufficient The chamber 21 formed 1n the interior of to. enable anyone skilled in the art to which he r l e by the platen 14 1S filled with all it appertains to make and use the same, refo any d sirable pressure by means of an erence being had to the accompanying drawpump 22 providedwith a diaphragm 23 15 ings, in which like reference characters refer h to the stem 24 y the Washers *2 to like parts throughout the specification. the h 26 The alr pump 22 1s The object of th invention i t id a located w thin a cylindrical-recess 27 formed simple, efficient roller for use upon type- 111 e h ft --1. The stem 24 prqects writers. The roller is of a pneumatic charr gh an ap rture 28 in the-plug 29 screwby the striking of the type against the surhaving key h0les 30 for its assembling. face of the platen, as well as to eliminate There s it handle 31 for the Sultable the noise therefrom. These objects are atnlpul tlon of the pump 22. The recess 27 tained by the mechanism illustrated in the, terminates'in a recess 33 constructed at right 25 accompanying drawings in which: angles to the recess 27 and opening into the Figure 1 is a central section of the roller, in ri r f the cham r 21- Th opening of showing parts in elevation and the middle h recess 33 1s normally closed by the memportion broken away g. Fig. 2 is a, fragher 34 secured to the outer end of the spring mentary enlarged section of one end of the 35, which is fastened at 36 to theshaft 1.

3o roller; Fig. 3 is a central section of a washer On either end, 3 and .4, of the shaft 1- employed; Fig. 4 is a plan view of a nut emthere is mounted the members 37-37, whose ployed. I outer surfaces are corrugated. The mem- Referring more-particularly to the drawbers 37 are held upon .theends, 3 and- 4 of ings, the roller comprises a central shaft the shaft -1 by the set screws 38, thatx et--1-reduced at either end, as at 3 and 4, pass through the threaded a ertures in the whereby to form the shoulders 5-5. There sleeves 39 of the members 3?, and thereby is mounted upon the reduced ends 3 and 4, engage the surfac s of the ends 3 a1id4 of the sleeves 6-6, which have central aperthe shaft -1--. The members 37 are pro-- tures ada ted to roject over the enlarged vided with a concave portion 40 for the purto portion 0 the sha 1. Annular recesses pose of ornamentation, as well as to permit,

, are formed by the shoulders 7 of the shaft at the end 3, of the convenient grasping with the end walls 8 of the sleeves 6. of the handle 31 of the pump 22.

I The end walls 8 are provided with the The assembling of the roller is effected Y orifices 9 for the insertion of the reduced by mounting the packing washers 20, and [00 at portions 3 and'4 of the shaft 1-. Upon the sleeves 6 and 10 upon the ends 3 and 4 the sleeves 6 are screw mounted the sleeves of the shaft -1- and engaging the ends 1010 having the beveled surfaces 1l-11 of the platen 14 between the beveled surwhich coiiperate with the correspondingly faces 11 'and'12; of the sleeves 10 and beveled surfaces 1212 of the washers washers 13,.respectively. These parts are 1% to 13-13 to hold or look the ends of the platen locked in position by the octagon nuts 17.

14 in assembled position. The washers 13 The platen 14 is drawn tight in a longitw.

are each provided with a central aperture dinal manner, whereby to take up any slack 15, so as to be mounted upon-the smooth by turning in a given direction, the sleeves cylindrical surface '16 of the sleeves 10' and 6, which are provided with nut heads 41 for at are held in assembled position by the octathe purpose,'and thereby causing-the sleeves gen nuts 17-17, whlch are screw mounted 10 to travel longitudinally outward from,

the center of the chamber 21, or in opposite directions from each other. The tightening of the platen 1% also efi'ects a pressure of the end walls 8 upon the packing washers 20, whereby to not only make an air tight joint at that part but also to hold the sleeves 6 tightly against the shaft 1, so that the same and the other parts mounted thereon together with the platen lt will revolve with the shaft 1. As thus assembled the roller is mounted in its proper place vin a typewriting machine or other similar device.

The chamber 21 of the roller can be filled with air and kept filled with air to any desired degree by working occasionally the air pump 22, which sucks in the air through the orifice 42 in the plug 29 and compresses it into the chamber 21 by way of the recesses 27 and 33. The member Set will yield, as shown in dotted lines in Fig. 2, upon each compression stroke of the pump to admit the air to the chamber 21 and will close immediately thereafter because of the normal. tendency of the spring 35. The members 37 permit the roller to be turned independently of the actuating mechanism of the typewriter.

2. In a roller, a platen, a chamber in said roller, means for holding air under pressure within said chamber, means for increasing said pressure to any desired degree and sleeves l'or drawing said platen in a longitudinal direction, whereby to tighten the same.

3.' In a ro'lier, a platen, washers having beveled surfaces for securing the ends of said platen in assembled position, compressed air for holding 'the surface of said platen in yielding position, means for keeping said compressed air in normal condition and sleeves for drawing said platen in 'a longitudinal direction, whereby to tighten the same.

4. In a roller, a platen, a chamber in said roller, means for holding airunder pressure within said chamber, a pump for keeping said pressure up to normal pressure and sleeves provided with nut heads for drawing said platen in a longitudinal direction whereby to tighten the same.

5. In a roller, a platen, a sleeve and a washer for holding each end of said platen in assembled position, a second sleeve for tightening said platen, a chamber within said roller, and means for forcing air into said chamber, whereby to form a pneumatic cushion for said platen.

In testimony whereof I have allixed my signature in the presence of two witnesses.

JAllIES S. JOIINC'JTON.

T. L. WILDER. 

